What is the tallest building in north america?

:calculate the sum of the interior angles of a 13-sided polygon.

Which of the following statements best characterizes changes to agriculture in the united states since 1900? a. increased mechanization has reduced the need for labor.b. increased mechanization has increased the need for water, thereby increasing the need for labor.increased mechanization has increased the use of land, thereby increasing the need for labor.d. increased mechanization has increased food production, thereby increasing the need for labor. select the best answer from the choices provided.

In the figure, polygon abcd is transformed to create polygon a′b′c′d′. this transformation is a by a factor of .